Answer:
B). Since the leader consolidated all the power for his own use, the country is now essentially an autocracy.
Step-by-step explanation:
The sentence that employs the underlined word correctly is displayed through option B as mentioned above. It employs the word 'autocracy' aptly as here, it comprehends the meaning of the sentence. Autocracy implies a government ruled by an individual or a single party and therefore, possessing absolute power and authority.
Since the leader integrated all the power(absolute power) with himself so the country could be an 'autocracy'. Thus, the statement is justified. The other options to fails to justify the words employed like option A wrongly employ 'democratic' for 'sole decision-maker', option C repeats the same mistake('democracy' with 'solitary queen') and option D inadequately uses 'autocratic' with 'implementing citizen's actions'. Hence, option B is the correct answer.